I must be clueless. What's the Tarzan kiss test please?
Some might not be happy with just the mention of his name (a banned member) so I won't repeat his name.
Basically, when an SP has an extra charge for DFK, they often charge for it but fail to deliver.
The test is to pay for the agreed services, bar the fee for DFK. Then hold out the fee for DFK and ask the SP for a sample of DFK. If she passes, you hand her the cash.